I think a good trade off, if your infra is in TF, is to be able to run your scripts with a parameterized AZ/region. That way you can reduce the downtime even more at a fraction of the cost. (assuming the services that are down are not the base layers of AWS, like the 2020 outage)
If you can get the data out of the downed AZ, don't have state you need to transfer and are not shot in the foot once the primary replica comes online again. I've rarely deployed an app where it was as easy as just to change a region variable.
Depending on the size of the company it can be simple or hard. Most companies that need this are not huge. Things like RDS, Elasticache, ECR and Secrets have multi AZ integrated so not hard to do it. If you operate on ECS or EKS it's pretty straightforward to boot up nodes and load balancers in another AZ.
Maybe you have a system that requires more hands on work and want to explain your point of view? I don't appreciate the snarky responses tho.
